package com.mmall.service.impl;

import ch.qos.logback.core.joran.event.SaxEventRecorder;
import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import net.sf.jsqlparser.schema.Server;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.annotations.Param;
import org.omg.PortableServer.SERVANT_RETENTION_POLICY_ID;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import java.util.UUID;

@Service("iUserService")
public class UserServiceImpl implements IUserService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if( resultCount == 0 ){
            return ServerResponse.createByErrorMessage("用户名不存在");
        }

        String md5Password = MD5Util.MD5EncodeUtf8(password);
        User user = userMapper.selectLogin(username, md5Password);
        if( user == null ){
            return ServerResponse.createByErrorMessage("密码错误");
        }

        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess("登录成功", user);
    }

    public ServerResponse<String> register(User user){
       ServerResponse validResponse = this.checkValid(user.getUsername(), Const.USERNAME);
       if( !validResponse.isSuccess() ){
           return validResponse;
       }
       validResponse = this.checkValid(user.getEmail(), Const.EMAIL);
       if( !validResponse.isSuccess() ){
           return validResponse;
       }
       user.setRole(Const.Role.ROLE_CUSTOMER);
        //MD5加密
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));
        int resultCount = userMapper.insert(user);
        if( resultCount == 0 ){
            return ServerResponse.createByErrorMessage("注册失败");
        }
        return ServerResponse.createBySuccessMessage("注册成功");
    }

    public ServerResponse<String> checkValid(String str, String type){
        if( StringUtils.isNotBlank(type) ){
            //开始校验
            if( Const.USERNAME.equals(type) ){
                int resultCount = userMapper.checkUsername(str);
                if( resultCount > 0 ){
                    return ServerResponse.createByErrorMessage("用户名已存在");
                }
            }
            if( Const.EMAIL.equals(type) ){
                int resultCount = userMapper.checkEmail(str);
                if( resultCount > 0 ){
                    return ServerResponse.createByErrorMessage("email已存在");
                }
            }
        }else{
            return ServerResponse.createByErrorMessage("参数错误");
        }
        return ServerResponse.createBySuccessMessage("校验成功");
    }

    public ServerResponse selectQuestion(String username){
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if( validResponse.isSuccess() ){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        String question = userMapper.selectQuestionByUsername(username);
        if( StringUtils.isNotBlank(question) ){
            return ServerResponse.createBySuccess(question);
        }

        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

    public ServerResponse<String> checkAnswer(String username, String question, String answer){
        int resultCount = userMapper.checkAnswer(username,question,answer);
        if( resultCount > 0 ){
            //说明问题及问题答案是这个用户的，并且是正确的
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX+username, forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题答案错误");
    }

    public ServerResponse<String> forgetResetPassword(String username, String passwordNew, String forgetToken){
        if( StringUtils.isBlank(forgetToken) ){
            return ServerResponse.createByErrorMessage("参数错误，token需要传递");
        }
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if( validResponse.isSuccess() ){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX+username);
        if( StringUtils.isBlank(token)){
            return ServerResponse.createByErrorMessage("token无效或者过期");
        }
        String a = null;
        if( StringUtils.equals(forgetToken,token) ){
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int rowCount = userMapper.updatePasswordByUsername(username, md5Password);

            if( rowCount>0 ){
                return ServerResponse.createBySuccessMessage("修改密码成功");
            }
        }else{
            return ServerResponse.createByErrorMessage("token错误，请重新获取重置密码token");
        }
        return ServerResponse.createByErrorMessage("修改密码失败");
    }

    public ServerResponse<String> resetPassword(String passwordOld, String passwordNew, User user){
        //防止横向越权，要检验一下这个用户的旧密码，一定要指定这个用户，因为我们会查询一个count(1)。如果不指定用户，那么结果就是true，即count>0
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld), user.getId());
        if( resultCount == 0 ){
            return ServerResponse.createByErrorMessage("旧密码错误");
        }

        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if( updateCount > 0 ){
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return ServerResponse.createByErrorMessage("密码更新失败");
    }

    public ServerResponse<User> updateInfomation(User user){
        //username不能更新
        //email也要进行一个校验，校验新的email是不是已经存在，并且存在的email如果相同的话，不能是我们当前的这个用户的
        int resultCount = userMapper.checkEmailByUserId(user.getEmail(), user.getId());
        if( resultCount>0 ){
            return ServerResponse.createByErrorMessage("email已存在，请更换email再尝试更新");
        }
        //仅更新如下几个字段，是为了防止被恶意修改一些不想被修改的参数例如说user.role造成纵向越权。
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
        if( updateCount>0 ){
            return ServerResponse.createBySuccess("更新个人信息成功", updateUser);
        }
        return ServerResponse.createByErrorMessage("更新个人信息失败");
    }

    public ServerResponse<User> getInformation(Integer userId){
        User user = userMapper.selectByPrimaryKey(userId);
        if( user == null ){
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    //backend

    /**
     * 检验是否是管理员
     * @param user
     * @return
     */
    public ServerResponse checkAdminRole(User user){
        if( user!=null && user.getRole().intValue()==Const.Role.ROLE_ADMIN ){
            return ServerResponse.createBySuccess();
        }
        return ServerResponse.createByError();
    }
}
